Riot police stand at the entrance as other police officers control some hundreds of protesters outside the headquarters of Koza-Ipek Holding, a business group that owns opposition television stations and newspapers in Ankara, Turkey, Tuesday, Oct. 27, 2017. The government accuses the movement led by Fethullah Gulen of attempts to destabilize it, and critics denounced the action as a government crackdown on opposition voices ahead of an election Nov. 1.(AP Photo) (The Associated Press)

ISTANBUL – Police in Istanbul have carried out a dawn raid, using tear gas to enter the headquarters of a media company linked to a government critic, enforcing a court order to seize the business.